US302848A - Furnace - Google Patents

Description

(No Model.) 4 Y K; lVI. JARVIS.

FURNAGB.

No. 302,848. Patented July 29, 1884..

N. Pneus. Phowumagnpner, miningm n4 c.

raten@ -KINGSBURY M. JARVIS, OF MALDEN, ASSIGNOR TO JARVIS ENGINEERING COMPANY, F BOSTON, MASSACHUSETTS.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 302,848, dated J'Yuly 29, 1884.

Application tiled March 15, 1883.

To all whom, it may concern:

Be it known that I, KiNGsBURY M. JARvIs, of Malden,county of Middlesex, State of Massachusetts, have invented an Improvement in Furnaces, of which the following description,

in connection with the accompanying drawings, is aspecication, likeletters on the drawings representing like parts.

My invention, relating to furnaces, has forits IO object to control the admission of air or oxygen to combine with the fuel, and also to control the passage for the escape of the products of combustion to the uptake or chimney, so that the said escape or outlet of the furnace will always be proportional to the amount of air admitted, and the furnace will thus always work freely, and the fire will be completely under control of the attendant.

The invention is shown embodied in a fur- 2O nace substantially such as described in Letters Patent No. 222,681, granted to me December 16, 1879, in wich the walls of the furnace are provided with air-heating passages, through which the air is admitted tothe combustionchambers above the fuel on the grate, the said `air thus being heated to4 a high temperature, and combining readily with the partiallyconsumed gases and smoke arising from the fuel and producing perfect combustion. In my for- O mer furnaces the air thus admitted and heated in its passage through the Walls has simply been drawn in bythe natural draft of the furnace, the said passages having as their inlet merely openings to the atmosphere. In my present inyention the said heatingpassages are connected with an air-forcing apparatus, shown in this instance as a fan operated by steam in any suitable or usual manner, and the said forcing apparatus and the damper in 4o the iiue or passage to the stack have controlling mechanism common to them both,whereby the said damper is opened and a freer exit is afforded to the products of combustion in proportion to the increase in amount of air admit- 4 5 ted or introduced by the forcing apparatus.

Figure l is afront elevation ofafurnace embodying" this invention, and Fig. 2 a side elevation thereof.

rlhe furnaceAmay be substantially the same 5o as in Letters Patent Nos. 17 6,633, 186,734,

189,862, or 222,631, it being provided with one (No model.)

`or more ai r-heating passages or ducts, a b, ,in its walls, through which air circulates, and from which it is admitted to the combustionchamber of the furnace at a high temperature. 5 5 In the present invention the said ducts a b are connected with passages c, shown as formed in the front walls of the furnace, and themselves connected with pipes d, branchingI from an airforcing apparatus,consistingin this instance of 6o a fan-blower, e, of anyusual or suitable construction, actuated bysteam from the steam-pipef. The flow of steam through the pipef, and the consequent speed of the blower and amount of air carried into the pipes d and ducts a b, is

.controlled by a cock or valve, t', which thus,

constitutes a draft controlling device, and is operated by a rod or link, m, connected with the actuating-arm n of the damper o in the cscape-fiue fr of the furnace, by which the escape 7o of the products of combustion is controlled. rlhe said damper o and cock i are thus causedto operate in unison, and are so arranged that they are both opened and closed together, thus increasing or decreasing the passage for the escape of the products of combustion from the furnace in proportion as the amount of air admitted is increased or decreased. The damper and cock are operated by a suitable handle or rod, t, connected with the arm n., so 8o that the attendant, by a single movement, operates both the damper and the cock by which the introduction of air is controlled.

The invention is not limited to the particular form of apparatus shown, as it is obvious that the air might be forced by other apparatus th an the fanbloWer, and that the amount of air admitted to the furnace might be controlled by a valve or gate in the pipe leading to the pipe A d, the essential feature of the invention being 9o that the ad mission of air and outlet for the products of combustion are controlled in unison, so that they always have the pr'oper relation to one another to insure the proper operation of the furnace. Anovel fairblower especially 9 5 adapted for this use will form the subject of another application for Letters Patent.

Vhen the present invention is to be applied to furnaces already constructed in accordance with the improvements referred to, the pipes roov d might pass down the outside of the Walls of the/furnace to the original inlet-opening of the ducts ab. An inlet-opening is preferably procombined with the outlet-flue or uptake and vided in the front Wall of the furnace, as at u, it being provided with .a covering-platemhich may be removed if it is desired to Work the furnace by natural draft only, or in case the air-forein g apparatus becomes temporarily disabled.

I Claiml. In a furnace, the smokeue and damper therein, air-ducts lleading to the ire and separate from said smoke-iiue, and an air-forcing apparatus for said ducts, combined with mechanism for controlling the air-forcing apparatus and the damper in the smoke flue or stack' common to both, whereby the exit in the smoke-flue is properly proportioned to the admission of air to the fire, substantially as described.

2. The heating-duets in the walls oi" a 'l'urnace, and fan-blower for forcing air into them, and a cock or valve controlling` its operation,

damper therein, and actuating mechanism common to the said damper and controlling cock or valve for the fan-blower, substantially 2 5 as and for the purposes set forth. f

3. In a furnace, the heated air-ducts c and an air-forcing apparatus for said ducts, com-- bined with the cock or valve i, for controlling the operating medium of the air-forcingap- 3o paratus, and the damper o in the smoke-flue, botli the valve fi and damper o operable by mechanism common to both, substantially as described.

In testimonywhereoflhave signed my name 35 to this specification in the presence of two subscribing Witnesses.

KINGSBURY M. JARVIS.

Nifitnesses:

G. W. GREGORY, W. H. SIGsToN.

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